Apparatus for determining the motion of an object from a moving platform



ZBE HB m GR 195269551 '7 N 0 3 m,

Feb. 7, 1925. 1,526,551

P. KAMINSKI DE'JFLEJCTION I I. 15

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ENETED STATS RATE??? @FEEQE.

PAUL KAIVIINSKI, OF BERLIN-PANKOW, GER-MANY, ASSIGNOB. T0 SIEMENS &HALSKE, AKTIENGESELLSCHAFT, OF SIEMENSSTADT, NEAR BERLIN, GERMANY, AGERMAN CORPORATION.

APPARATUS FOR DETERMINING THE MIOTION OF AN OBJECT FROM A MOVING-PLATFORM.

Application filed. February 8, 1924. Serial No. 691,460.

To all whom it may concern:

Be it known that 1, PAUL KArrrNsKr, a citizen of the German Empire,residing at Berlin-Pankow, Germany, have invented certain new and usefulImprovements in Apparatus for Determining the Motion of an Object from aMoving Platform, of which the following is a specification.

My invention relates to improvements in apparatus for determining themotion of an object from a moving platform.

Apparatus for determining the approach velocities of moving objects orthe so-called distance difference in a unit of time are already known.If such a determination takes place from a platform, which itself is inmotion, for instance a ship, the value indicated by the apparatusincludes also the own motion of this platform. For certain purposes itis, however, necessary, to ascertain the motion of the other part only,for instance that of a target, the enemy or any other object, i. e. todetermine that por tion of the total distance difference which is causedby the motion of the target or the like only.

The total distance difference 65 in a unit of time, for instance in aminute is (Z(tib cosine a. In this formula a is the velocity of approachor recession of the object observe-d, b the own velocity of the movingplatform of the ship in the unit of time and or the angle which the lineof sight forms with the direction of motion of the platform or thecourse of the ship.

The value a to be determined is thus a0Z -b cosine oz. It is somewhatdifiicult by consideration and calculation to combine the several valuesin the proper sense into a single resultant value.

The invention relates to an apparatus, which renders all calculationsunnecessary and which by simple adjustment of the known values gives thedesired value of the motion of the target or the like in the propersense. This object is attained according to the present invention by theaid of an epicyclic or planet wheel gear, whose first driving wheel isadjusted in correspondence with the own motion of the platform and whosepinion or planet wheel is adjusted in correspondence with the totaldistance difierence, so that the other free wheel of the gear performs amotion corresponding with the difierence of the two before mentionedvalues. This motion may be read off on a scale calibrated according tothe motion of the target in the unit of time. The operation of thedevice must, however, not take place in the customary manner, as anepicyclic or planet gear generally adds in the direction of rotation andsubtracts in the opposite direction. In the present problem the totaldistance difierence ascertained represents, how-ever, always the totalwhich is to be divided into two portions. Taking the signs of the aboveformula into consideration, the total distance difference must thereforebe adjusted on the pinion or revolving planet wheel. The free bevelwheel, the sun of the planet gearing then gives the correct motion ofthe target in regard to the sign.

In the accompanying drawing one embodiment of mv invention is shown byway of example. The improved apparatus is shown in a perspective view.

Referring to the drawing 1 is a crank by means of which the pointer 4 isfirst adjusted upon the dial 5 calibrated for instance according to owntravel in meters per minute by means of the worm gear 2, 3.Simultaneously the spindle 9 journaled in the frame 8 is rotated acrossthe bevel wheels 6, 7, so that the nut 10 moves along the screw spindle9. Then the pointer 14 is adjusted upon the dial 15 calibrated accordingto deflection by means of the crank 11 and the gearing 12, 13. Herebythe frame 8 is simultaneously turned. The nut 10 is thus radially movedin correspondence with the value of the own travel and turned incorrespondence with the deflection. This motion is multiplied in knownmanner with the cosine value by the sine link 16, whose upper horizontalportion 31 slidingly engages a detent 32 of nut 10, and which itself isslidably mounted in a guide 27, and the resulting motion is transmittedto the driving wheel 17 of the epicyclic gear. The motion of the wheel17 thus represents the value b cosine 0:. Finally the pointer 19 isadjusted by the crank 18 upon the dial 20 calibrated in accordance withthe total distance difference per minute and corresponding with thevalue all and hereby the pinion feeely movable element, means for one ofThe LY-I0 adjustable elemen deriee in correspondence with the theplatform. means iiier adjusting: the other of ihe uve ZLLhLli-Jtilhh?elements of and (iQKlCC according to the unegie hetween the 2:. 1: 4 e.1 u: Lille 0!. sight and the course 0L me planer-e men e1. :1(1JICfTQiIGQ'GR1 censis'i'ine Of an white-able eermined. planetarypinion, an mhusitahle drlrine' whee wheel and :1 freely driven Wheel,means in) 3 i connecting the rhirfi element of said 11'lHiiI 0' 1m i- 1.1 Q 1- u- -1 pi 1nc mice L0 in M immie e1 n U1? Yul. 01 said epleychegear, 11368715 adapted [0 mlust the planeiimfi v lumen of Sdltiapii-yehe r 111 eorreepemhmr with The rate 0% Mini change 01 range, 2mirdiezit Q (h 3((1 :zml ems fer eeiineetiiie the free (h'iren W1 1-! i1gear (0 said iiuiivnting of said planetary device.

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